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Firefox ESR vs Pale Moon: catalog facts
Firefox ESR	Pale Moon
Free Free and open source; Mozilla offers optional paid professional support for organisations.	Free The software is free under its open-source licence. Hosting, hardware and external…
Windows, macOS, Linux	Windows, macOS, Linux
Long-term stable feature set for managed deployments MSI and PKG installers plus group policy templates	It keeps the pre-Quantum Gecko engine and the old XUL extension model, so add-ons that Firefox dropped still…
New features arrive later than in regular Firefox Mainly aimed at organisations rather than home users	The source is MPL but the official binaries carry a separate branding licence, and its older engine misses…
Downloadable app	Downloadable app
Open source	Open source
License: MPL-2.0	License: MPL-2.0
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.